City-dwelling blue tits may lay bigger eggs because of what they eat
Blue tit eggs that were laid in urban parkland were 5% larger than eggs laid in a nearby forest, which could be due to differences in the amount of calcium available to birds in urban and forest environments, a study finds.
from Latest Science News -- ScienceDaily https://ift.tt/2xUZOK3
from Latest Science News -- ScienceDaily https://ift.tt/2xUZOK3
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